Pitman-box



(No Model.)

. T. W. BROOMELL.

I PITMAN BOX. No. 355,435. Patented Jan. 4 1887.

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NITED STATES PATENT FFICEQ THOMAS W. BROOMELL, OFCHRISTIANA,PENNSYLVANIA.

PlTMAN-BOX.

SPECIFICATION forming part of Letters Patent No. 355,435, dated January4, 1887. I

Application filed June 5, 1886. Serial No. 204,206. (No modeLlChristiana, in the county of Lancaster and State of Pennsylvania, haveinvented certain new and useful Improvements in Crank or Pitman Boxes;and I do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexeddrawing,making a part of this specification, and to the letters and figures ofreference marked thereon.

The present invention has relation to that class of boxes or bearingsformed in sections and provided with means for taking up the wear causedby the frictional contact of the journal or shaft thereof, and refersmore particularly to the boxes for crank or pitman connections, and tothe cross-head boxes of all engines, saw-mill crank-boxes, &c.

Heretofore it has been common to provide means for taking up the wear,consisting of a wedge forced against the box-section by the action of aspiral spring or screw.

Itis the object of the invention to improve the means heretoforeemployed whereby the action of the wedgeis morepositive; andtheinvention consists in connecting with an upright Wedge a horizontalwedge controlled by a spring which forces it forward, said wedgeforminga support for the upright wedge and acting as a follower toautomatically force it against the movable box-section, whereby saidsection is made to compensate for wear, as will be hereinafter describedand claimed.

. V In the accompanying drawing, Arepresents the cross-head end of theconnecting-rod, and

B O the two box-sections, formed of the metal usually employed for thepurpose. Theboxsection B, which is movable, has an inclined outer face,a, and between it and the inner end of the rod A is located an uprightwedge, D. The lower end of the wedge D rests upon and is supported by ahorizontal wedge, E, which I term the follower-wedge, and back of thiswedge is located a spiral or otherjform of spring, F, which forces itforward as wear occurs on the box and crank-pin, elevating wedge D andforcing inwardly the box-section 13.

It is evident that the means above described may be applied to allclasses of boxes or bearclined face, a vertical wedge interposed betweensaid face and cross-head end,and a horizontal wedge having the upperinclined face

